Automatic toll ticketing alarm system



Sept. 9, 1947.l F. B. LAKE AUTOMATIC TOLL TICKETING ALARM SYSTEM Filed June 27, 1942 l2 Sheets-Sheet l NWT.

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Sept. 9, 1947.: F. B. BLAKE AUTOMATIC TOLL TICKETING ALARM SYSTEM Filed June 27, 1942 12 Sheets-Sheet 2 w. N n m mm. m m5. We F. V. B

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AUTOMATIC TOLL TICKETING ALARM SYSTEMy Filed June 27, 19,42 12 Sheets-Sheet 3 TO /NT CIRCUIT POLAR/25D By 696,- M

` ATTORNEY SePt- 9, 1947. Ff B.v BLAKE 2,426,981

AUTOMATIC TOLL TICKETING ALARM SYSTEM Filed June 27. 1942 12 sheets-sheet` 4 I F/G.4

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. 1 1. T0 ALf'M /N VE' N TOR y fa-BLAKE ATTORNEV Sept. 9, 1947.r F. B. BLAKE AUTOMATIC TOLL '.lnICKEITlNGr- ALARM SYSTEM Filed June 27, 1942 12 Sheets-Sheet 5 .HTM-nl S 35 SSG w F. B. BLAKE Sept; 9, 1947;

AUTOMATIC TOLL TICKETING' ALARM SY'STEM 12 Sheets-Sheet 6 Filed June 27, 1942 D Mmm Nm. Nm

ATTORNEY Sept; 9, 1947.

F; BL BLA-KE .AUTOMATIC TOLL TICKETING ALARM SYSTEM Filed June 27, 1942 12 Sheets-Sheet 7 INVENTOR Y By FfLA/f,

ATTORNEY Sept. 9, 1947.

F. B.' BLAKE 2,426,981

AUTOMATIC TOLL TICKETING ALARM SYSTEM med Jun 2?. 1942 12 sheets-sheet 8- NUMER/CAL REG/S TENS /NVEN'TOR j 5 B. BLAKE By @$.M`

Amm/EV Sept. 9, 1947. F. B. BLAKE l AUTOMATIC TOLL TICKETING ALARMYSYSTEM Filed June 27. 1942 12 Sheets-Shet 9 /NVENTOR E B. BLAKE A TTOR/VEV Sept. 9, 1947. F. B BLAKE 2,426,981

. AUTOMATIC TOLL TIGKETING ALARM SYSTEM, l

Filed June 27, 1942 12 shee'ts-sheet vlo T0 NTERMEDM TE .FENDER A TTORNEY Sept. 9, 1947. l A F; B. BLAKE 2,426,981

AUTOMATIC TOLL TICKETING ALARM SYSTEM Filed June 27. 1942 12 Sheets-Sheet 11 T0 LAST SENDER 7'0 LAST TRUNK SEA/DER TRUNK CONNECTOR 'IHGUIT A /NVENTOR F. ls?. BLA KE ATT ORNE V Sept. 9, 1947. K F. B. BLAKE AUTOMATIC TOLL TIGKETING ALARM SYSTEM Filed June 2'?, 1942 12 Sheets-Sheet 12 nw Il. 1Min lllllllllllllllli lllllllllllllllllli SSE gam L mit Ok INVENTOR Y E B BLAKE By Q6.

ATTORNEY Patented Sept. 9, 1947 AUTQMAATIG TOLL TICKETENG.l ALARMl SYSTEMS:

Foster B; Blake, Mountain Vew-NC 1. assi'gnor to Bell rEe'lephone Laboratories,v Incorporated, New- York, N. Y;, a corporation of New York Application June 27, 1942,. Serial No. 'i4-8,1753.

18 Claims.

This invention relates to a telephone. system.

for` enabling calling.. subscribers to control the.

establishment of. toll connections by dialing and.v

in. which. system a toll, ticket having thereon all of the data requiredfolbilling a toll call is auto.-

matically printed.. More particularly, theV in.`

vention relates. to improvements in. a system of. the general` type. disclosed in Patent No. 2,300,829. granted N ov. 3'-, 1942'toJ. W'. Gooderham..

In the system. of the Good'erham patent, a. group. ot' tandem or automatic ticketing trunks is provided, each` trunk having a ticket printer. A subscriber desiring av connection to a line. terminating in an oice in the nearby tollarea dials the oiilce codev and numerical digits ofthe wanted line number andv in response, to the. dialing. of one. or more of. the oice code digits a. connection. is extendedto an idle one. of the ticketing trunks which has access to. the office in which the. wanted line. terminates. Immediately folflowingI the. seizure of. the trunk; an idle sender common. to. the. ticketing. trunks. is associated with the seized trunk. rlhe. sender is provided with registers for registering. the remaining digits of. a calledlline. number dialed by the calling.y subscriber and with registers for registering ther digits ofthe. calling. line number.

Since,.however a digit. dialed. by a calling subscriber might be. lost during the. time elapsing. from. the, seizure oi the trunk. and before. the

idle sender becomes. associated withthe trunk,y

the trunk is provided with a digit register .for

registering the digit dialed. following the last code digit, dialed to. reach the trunk. Since the trunk may be` seized by a. rst selector in response to the. dialingl of the rst office code digit of certain called office, designations, by a. second. selector in response toY the dialing of` the. rst two office code digits of other oiice designations, and. by

a third selector in. response to the dialing of all three office code, digitsio still other office designations, the register in. theA trunk may register either theA second or third oiilce code digit. or the thousands numerical digit. As soon. as the. rst.

digit has been registeredin theV sender, which digit may be either the third oiice. code digit, the thousands digit or the hundreds digit, anv idle. identifierA is associated with. the. sender over an identiiier-connector and the identifier is. associated. directly with. the trunk over a trunk-identifier-connector. Thereupon the. identifier reconstructs the oice code dialed by the callingsubscriber, which. information may be derived from the. trunk or fromv the. trunk. and sender,l and transmits this information to the sender. The

2i identier alsor proceedsto identify the. calling. line and. to transmitinformation. concerning. the designation digits of. such calling line. to. thev sender.

The., sender after registering. the. office code digits. of. the. wanted line, number transmitted to it from the identier and. the numerical. digits of thewanted .line number dialedinto the sender from. the calling line. proceeds to direct. the set.- ting of. selector switches to extend; aV connection from. the ticketing. trunk to the. wanted subscribersline. Such calledv oice, codev and nu.- merical registrationsare also. effective. to control.

theprinter of'thetrunktovprint on the, toll ticketg,

the oce code and numerical digits which identify the called line. In addition, the registrations of` the oiiice codefand'. numerical. digits of'v the. calling lineftransferred to the sender from the identi'- er are eiectiveto control' the printer to print. such digits on the tollv ticket. Provision is also made for printingA other data required for ticketing. the callsuch as, the. date and time the call was made. and the, elapsed time. of. conversation.

It. is. an object of the present invention to further improve an automatic ticketing` system of the typeabove described,.whereby a test may be made t'o determine whether a tip or ring substation. ona party line has initiated a call for enabling the. identifier to identify the directory number, of. the calling party line substation and.

whereby a check is made following the termina.- tion of conversation if a previous tip. party identificati'on was made to. determine whether. such.

identi'cation resulted from a bona. fide tip party call` or from a false line ground condition and. it made from a. false groundA condition to print a speciali notation on the ticket indicative. of. the fact that that ticket should. not be used'.

It is a further object oi". theV invention to provide facilities whereby in the event the identication of the calling, line fails, such line may be extended' to'. a monitoring` operators position whereupon thek operator may secure the callingn line identificationfrom the calling subscriber and whereby the ticket" printer is controlled to' print on theA toll ticket a specialnotation in4 lieu ofthe calling line designation dig-its.

To attain the: rst of' thesev objectsv the senderV is providedwith. relay equipment which associ'-v ates. a testirelay with'rthe tip-and: ring conductors'v ofi' theV connection. extending from the sender overA the ticketing; trunkand, to the'calling line; and-'prelimnarilypreparessuch testrelay. Ii thetest relay operates during a time interval due. to the ground at the tip station of the line, a tip party is indicated as having initiated the call. If the relay does not operate, a ring party is indicated. This party stationinformation secured by the sender is transferred to and registered in the identier associated with the sender whereby the identiiier is controlled to look for and identify a tip or a ring party substation. At the end of the conversation the same or another sender is seized and the party line test is repeated. The tip ground should not be present but if so the sender functions to control the ticket printer of the trunk to cause the sender number and a series oi dashes to be printed on the ticket to indicate that a grounded line was encountered and that the ticket should be disregarded for billing purposes. y

To .attain the second of these objects the sender is provided with apparatus whereby if the associated identier fails to complete the identication of the calling line, the calling line is extended through the sender to a trunk terminating tion thereof, the dial pulse receiving circuit of the sender;

Fig. l1 shows a sender-trunk-connector of an A group for connecting any seized sender with the ticketing trunk of the A group of ticketing trunks which has seized such sender;

Fig. 12 shows a sender-trunk-connector of a B group for connecting any seized sender with the ticketing trunk of the B group of ticketing trunks which has seized such sender; and

Fig. 13 is a chart showing how the several iigures of the drawing should be arranged to fully disclose the invention.

The line iinder |83 and the selector switches |84. |85, and |86 of Fig. 1 are of the well-known step-by-step type and the selector switches are at a monitoring operators position. The monitoring operator upon answering the call on such trunk may then challenge the calling subscriber to secure his directory number and the number of the line with which he desires a connection. The toll ticket for the call is then printed in the usual manner except that a special notation is printed on the ticket in place of the calling line number which the identifier failed to secure, which notation informs the billing department that the toll ticket for the call should be supplemented by the information which the monitoring operator secured from the calling subscriber and recorded upon an auxiliary manually made toll ticket.

The invention having been described in a general manner, reference may now be had to the following detailed description thereof taken in connection with the accompanying drawing in which: Y Y

Fig. 1 shows a two-party line, the schematic representation of a line iinder;prst, second and third selector switches over which access may be had to an idle one of a plurality of automatic ticketing trunks, one of which is disclosed in Figs. 2, 3 and 4, and to the right of the dot-dash line, the schematic representation ci' a trunknder of a B group of trunk finders, individual to a sender for connecting such sender with a calling one of a B group oi one hundred ticketing trunks;

Figs. 2, 3 and 4 taken together show a com' plete ticketing trunk including a digit register, duration of conversation registers and an automatic ticket printer;

Fig. 5 shows a trunk finder ofthe A group of iinders individual to the same sender as the trunk finder of Fig. 1 for connecting the sender with a calling one of an A group of one hundred ticketing trunks;

Figs. 6 to 10, inclusive, show such portions of a sender as are deemed necessary for an understanding of the invention; Figs. 6, 'l and 8 showing control relays and Fig, 8 also showing a progress switch for successively associating groups of sender registers with the ticket printer of Fig. 4; Fig- 9 showing in the lower left portion one of the sender registers and a box representing other registers, a boxv representing an identifier and timing equipment of the sender, and Fig. 10 showing in the lower portion thereof the sender monitoring trunk and the relay equipment of the sender associated therewith and in the upper poroperative in response to the dial of a calling line to establish local connections or to establish a connection with an idle automatic ticketing trunk, such as is disclosed in Figs. 2, 3 and 4, should the subscriber desire a connection with a subscribers line which terminates in the toll area adjacent to the exchange area in which the calling line terminates. As disclosed the ticketing trunk of Figs. 2, 3 and 4 has a branch which ter'- minates in the bank of a first selector |84, another branch which terminates in the bank of a second selector |85, and still another branch which terminates in a'bank of a third selector |86 whereby the trunk may be seized in response to the dialing of the iirst oiiice code digit of a certain distant oice, in response to the dialing of the first and second oilce code digits of another oiiice and in response to the dialing of the three office code digits of still another oilice.

The brushes 35| and 352 of the digit register are advanced step'by step in response to the operation of the stepping magnet 353 and are restored by the operation of release magnet 354. The brushes 40| and 402 of register 400 are advanced step by step by stepping magnet 403 and are restored by release magnet 434 and the brushes of register 450 and progress switch 850 are advanced step by step from their normal positions and are returned to their normal positions by a further forward stepping movement.

The ticket printing mechanism 460 associated with the automatic ticketing trunk may be of the type disclosed in the Patent No. 2,309,688 granted Feb. 2, 1943, to W. J. Zenner.

Two trunk iinders of the step-by-step double brush set type are individualized to each sender. One pair of such trunk-finders is disclosed in Fig. 5 and in the right portion of Fig. 1. One brush sei-I of the A nder shown in full in Fig. 5, has access to an upper bank of terminals in which control conductors from a first one hundred ticketing trunks terminate and the other brush set has access to a lower bank of terminals in which other control conductors from the same one hundred trunks terminate. One brush set of the B iinder shown schematically in the right portion of Fig. 1 has one brush set which has access to an upper bank of terminals in which control conductors from a second one hundred ticketing trunks terminateand a second brush set which has access to a lower bank of terminals in which other control conductors of the same one hundred trunks terminate.

Since a trunk-finder does not have suflicient brushes in both of its brush sets to, accommodate accesar.

all. of the. control conductors required between; a. trunk: and;l a sender,v a. plurality of. additional sender-trunlc-connectcr circuitsA is` provided; that shown: in.: Fig.. 11' having a multicontact relay individual. relay toeach senderv andten multcontact relays` individual respectively to ten trunks.. Ten; of;` suchV circuitsy serve4 the A group` of onezhundred-l` trunks.` Fig.` 1-2 showsV oneof the. ten. similar circuits w-hi'ch; serveI the B? group of; one hundred trunks;

As previouslystated-only so. much of' one of the.

senders-is.- disclosed asis deemed necessary` for atY complete understanding of the invention, only.y one. of the registers ofthe; sender'beingrpartly"disL closed nr Fig.. 9` and the circuits for controlling outrpulsing: being' omitted'. The.- day and hour.l circuit; and identifier have. not been disclosed; as they are concerned only incidentally with the presentinvention. For a full disclosure of theienztire systenr to which". the present invention; is. ap plicable; reference may be had to the application of fJ Gooderham Serial No ,448,782; iledLcon.- currently herewith.V

To morer clearlyl set forth the novelxfeatures of the invention', it will. rst; be: assumed. that: theK .tip

party, whose substation is identied by the nur meral lill. in Fig.. 1, initiates a. call for.' aztollconnection. to a subscribers line terminating. in an ofce of a toll arcate` which the calling subscriber" iszpermitted accessV by dialing., Upon the removal ofthe receiver from' the switchhook, an. idle line: nder; having access to the calling line, such: as. the line nderl ltisstarted in search of thecall.- ing, line in a-well-known manner. Whenth'e line finder has. found the; calling, linev the usual. dial tone is transmitted over the. calling" line to l inform the.V subscriber that. his line hasbefeni connected', with: a. rst. selector- |8'li paired. with the line. iinder |83, andA that he may thereforecommence dialing the digits-of the wanted line number..

lt will'. be assumed that the calling subscriber. desires aconnectionwith a line whose directory number is MAR-1345- and thatY a ticketing trunk; overwhich the connection may be. extendedmay be; reached from the sixth level of the banky of irstselector |84. The calling subscriber' upon hearing the: dial. tone therefore.` proceeds.: tol dial? the oce code letters M, A, R, and' thefnumericaly digits 1,Y 3, 4" and-.5. In response: to the dialing.

of the; rst ofllce. code.y letter M, which has anumerical equivalent 6; thev rst selector |134; is: operated to elevate its brush set to a positionaopposite the. six-thbank level and. to then hunt over the terminals of this. level in; search of an; idle.

ticketing trunk. ItA will bev assumed that the. trunk disclosed ink Figs..2, 31 and 4- is idl'eand that therefore when the test or sleevebrush of selec'- tor `|813 engages the test or sleeve terminal'4 I8] ofv the. branchV of this trunk, it finds no busy ground` potential thereon, and therefore the. selector seizes thetrunk. A circuitL is. 'thereupon effective from ground; at the selector over the sleeve.v conductor 202 ofthe trunk, through they upper normal contactszandzuppcr. winding of sleeve relay 2.03, over thelower normal contacts. of busy test jackY 202i-,AL through the winding of relay. 205 and ini parallel therewith over the back Contact of relay 4Zilli and throughV resistance 206 to battery and ground; Relay 203'l operates from the low resistance. battery thus supplied, locks. frombattery through its? lower winding andoverits lower iront contactto the sleeve conductor 202'; opens the initial-operatiing circuit through its. upper'winding, connects: its, lower winding over its: upper` and' lower front contacts inparallel .with the winding ofrelay. 205,;

6. and. prepares a1 circuit: overits inner-"lower front, contacttor'a purpose. to. be: later described.v Relay-v ZDi'r-alsjcr` operates and. removesresistan-ce 203 from A5,'. soon as the talking circuit isv cut through at theI the parallel connection with its winding.v

, ductor 205| the; lower No. 2 back contactr of relayA 21:0, the-upper'Notflback' contact of.r relay 2100, the; upper Nol. 5. back. Contact of relay 208i to battery throughuthe upper windingrof relay 287|. Relay;v

20115 thereupon operateszclosing'over its front corr- W tact a circuitiorslow-to-release relay 2:||: whichi maybe traced from: ground: over: the uppenNo; 5;-

baclc contact of relay 20B; over. thee front: contact otV relay.V 2021?, to.y battery through the windingY of relay-2H.. Relay=2|1| thereupon operates;,estab:-

. lishes, a circuit for slow-to-release relay; 300; exe

tending from: battery through` its' winding,` over.`

conductor 30P-if toi.v ground over the middleA lowerrv contactsoi? relay. .Zlfl prepares over its upper contact-a` circuit ffor the` stepping magnet 3:53Y of the.

digit' register 3.50,V and forthe slow-to-releasev re,

lay 302.-; connects ground from thevlower No. 31

back contact of relay' 2m; over itsl inner lower front-contact, the lower'No. 3'back contact of reilay 2425130' the trunk start conductor 21:5 which-is common toV the ten trunks of a subgroup' and?. establishes a connection from ground andbattery through the winding of relay 2|5, the upper No.V 21T back contacteer relay 2M, the lower contact of relay 2H, to conductor 2|? to mark4 the trunk:

as calling so that the started trunk finder will stop onthe terminals of suchA trunk. Relay 300, upon operating, connects ground' over the lowerh No. 2 back contact of relay 303-; the lower front contact of` relay-360', conductor .3041, overthe in@ ner No; 1 normal contacts of relay 218-,` the lower contacts of test' jack 2041; the upper contacts andE through the lower winding of sleeve rela-y 203 to battery'for'holding the sleeve relay operated afterl groundi's removed at the selector |315, and over' the lower contacts of relay 203 to sleeve conduc`v tore 202 of the trunk'to hold ther selector |04? andi the line finder |83 from releasing.

When-relayz releases dueV to the opening of theclialing circuit for the first pulselof'th'e secondv code letter A, the circuit for magnet 353 and the circuitY of relay 332 previously prepared by the operation ofy relay 2 i'1 I', are completed from ground over the upper No. 5 contacts off relay- 239, they back contact ofl relay 201, the upper contacts'- of? i relay 2| |f,' conductorA 2|2, the lower normal con tacts of off-normal switch 355 of the digit registerA 350; through'the lower normal contacts and winding of' relay 302E to battery andV lground and in parallel over'the upper No. 4 back contact of relay- 3352A through the winding ofk stepping magnet 353'v to battery and ground. Magnet 353 and relay 302 both operate, relay 302v because of its slow-to-re'- lease characteristic remaining operated until the termination of thel impulse series. Upon the-first step advance of the register brushes 35| and 352,v theA oit-normal switch 355 becomes operated, whereupon the operating circuits of relay 302'and magnet 353 are extended over the lower alternate contacts-vof' relay 302', over the circuitV traced-to .gronndoverthecontacts of relay 209i Since-the second'code letter dialed was A, two impulses are transmitted in the impulse series and brushes 35! and 352 are advanced to the second terminal pos1- tions of their arcs. Uponthe termination of this impulse series relay 302 releases.

In the meantime, however, theiconnection of ground to the trunk finder start conductor 2 I 6 has caused the operation of the group start relay 50 IL which is allocated to the last subgroup of ten trunks of the A group of one hundred trunks. Ten group relays are provided individual respectively to the ten subgroups of trunks of the A group, one of the group relays individual to an intermediate subgroup. being shown at 50II and the group relay of the rst group being shown at 50 I F. Ten similar group relays would be provided for the ten subgroups of the B group of one hundred additional trunks and associated with the B group of trunk iinders, one of which is disclosed schematically in Fig. 1. Group relay 50IL upon operating connects ground over its inner lower contact to the level segments 503 of the vertical commutators 502 of all trunk iinders of the A group having access to the A group of trunks; connects ground to the trouble alarm circuit 504 and causes the operation of the start relay 509 of the rst idle trunk finder. The trunk finders are divided into preference subgroups in accordance with the subgroups of trunks whereby any trunk of a subgroup has the preferential use of the trunk finders and associated senders of a particular subgroup. If at any time all the trunk finders which are first choice preference of a subgroup of trunks are busy such subgroup of trunks then has second choice use of the trunk nder of another subgroup which is normally the rst choice of another subgroup of trunks.-

The trunk finder 500 disclosed in Fig. 5 is the rst nder of the last group of finders allocated as first choice to the last subgroup of trunks to which the group relay 50IL appertains. It will be assumed that this finder is idle and that therefore upon the operation of relay 50I L, a circuit is established from ground over the back contact of relay 505, the upper contacts of relay 50| L, in start conductor 506, over the middle normally closed contacts of the test and busy jack 501 of the trunk finder 500, the inner upper normal contacts of relay 508, through the winding of start relay 509 to battery and ground. Relay 509 upon operating connects ground over its inner upper' front contact to conductor 5I0 and causes the operation of vstepping relay 5II ina circuit extending from ground over the inner lower front contact of relay 509, interrupter contacts of vertical magnet 5I2, interrupter contacts of rotary magnet 5 I 3, the lower winding of relay 5I I to battery and ground over the inner lower back contact of relay 508. Relay 5II upon operating causes the operation of the vertical stepping magnet 5 I 2, over a circuit extending from ground at the inner lower front contact of relay 509, over the front contact of relay 5I I, the upper back contact of relay 5M, through the winding of magnet 5I2 to battery over the inner lower back contact of relay 508. The brush shaft of the nder is thereby lifted one step, placing the commutator brush 5I 5 on the first wired segment of the vertical com- 5 I 2. In this manner magnet 5 I 2 is repeatedly operated'and released to advance the brush shaft upwardly step by step until the commutator brush 5 I 5 engages the grounded segment 503 whereupon a circuit is established from ground on such segment over brush 5I5 through the lower winding and relay 5M, over the interrupter contacts of rotary magnet 513, through the lower winding of relay 5II to battery and ground over the inner lower back contact of relay 508. Relay 5I I is thus held operated to prevent further stepping and relay 5M, which is slow to operate, operates after an interval suflicient to permit the brushes to cease vibrating following the completion of their last vertical stepping movement and before they are started in their rotary stepping movement.

When relay 5I4 operates, it locks in a circuit from battery over the inner lower back contact of relay 508 through the winding of magnet 5I2, through the upper winding and inner upper front contact of relay 5M, to ground at the inner lower front contact of relay 509; opens at its inner lower back contact, the circuit extending over the lower contacts of the oir-normal switch 5I6 through the winding of release magnet 5I'l, and transfers the stepping circuit control of stepping relay 5II from the vertical magnet 5I2 to the rotary magnet 5I3. With stepping relay 5II now operated, the circuit of the rotary magnet 5I3 may be traced from ground over the inner lower front contact of relay 509, contacts of relay 5I I, upper front contact of relay 5I4, through the winding of magnet 5I 3 to battery and ground. Relay 5I3, upon operating, advances the brush set of the nder one step in a rotary direction and opens at its' interrupter contacts the holding circuit for relay 5II previously traced and the operating circuit thereof extending from ground over the inner lower front contact of relay 509, the interrupter contacts of magnet 5I2, the interrupter contacts of magnet 5I3, the lower winding of relay 5II to battery over the inner lower back contact of relay 508, whereupon relay 5H releases in turn releasing magnet 5I3. Magnet 5I3 upon releasing reestablishes the operating circuit of relay 5I I, which in turn reestablishes the circuit of magnet 5I3 to advance the brush set another step in the rotary direction. In this manner the brush sets are advanced step by step until the test brush 5I8 encounters the test terminal 5I9 of the calling trunk.

It has been assumed that the calling trunk of Figs. 2, 3 and 4 appears in the last terminal set of the levels of the banks of the trunk nder 500 corresponding to the commutator segment 503 which levels are partly shown and therefore when the brush sets have been stepped vertically to a position opposite such levels in their banks, as illustrated and have been advanced ten steps in the rotary direction into engagement with the last terminal sets of such levels, a circuit will be established from battery applied through the winding of relay 2I5 of the trunk over conductor 2I`I, to the test terminal 5I9, thence over test brush 5I8, through the lower winding of relay 520, upper back contact of relay 508, through the upper winding of relay 5I! to ground on conductor 5I0. Relay 5II is held operated over this circuit to prevent further rotary stepping of the switch shaft, and relay 520 operates sufficiently to close its upper No. 1 contacts thereby establishing a circuit from battery, through its upper winding,

over such contacts, the lower contacts of rotary magnet 5I3, contacts of relay 5II to ground over the 'inner lower `contacts Vof 'relay 50S. With Vboth of its windings -now energized, relay -520 fully 'operates -to extend 'control conductors 2If9 to v220, inclusive, -'of"'the trunk over brushes =52-I vto"526, inclusive, ofthe trunk iinder and the upper Nos. f4 'and 5 to lower Nos. 2 to 5 contacts of nrelay 2520 to 'conductors 527 to 532, inclusive, extending to the sender; 'to 'cause the operation ofreilay l500 v'in acircuit 4extendingfrom ground over 'the olf-normal'springs-5I6,the No. 3 upper front 'contact of relay 520, through the lower wind- "ing of relay `5.08 'to battery `and ground; to 'conneet sender `conductor 5.33 over its lower No. l contacts to brush vv530, thence to vconductor 535 which is .multipled to corresponding bank Ater- *minals in the 'same -vertical row .of the upper `lnder bank; to open at 'its No. .3 upper back conu tact another point `in the circuitof release magnet -11 ,and to'rprep'are a'locking circuit vforitself over its No. "1 upper iront contact which will .be keective'iollowing'the operation of relay 508.

`lltelayzll `upon `operating extends a connection romtrunk conductor 2H, over terminal 5.!.9 and Ybrush '.510., `the upper No. 2 contactsof .relay 520 andthe upper ,front contacts ofrelay500 to conductor 5I0 extending to the sender; completes the locking circuit of .relay 52.0 .extending .from battery through the upper winding 4and No. 1 upper :contacts 'of relay 520, the lower 'front contact of .relay "503 to ground on conductor 5I`0;

disconnects 'the lower winding of relay 520 .from

the test brush 518; transfers at its inner upper contacts Ythe in-.start `conductor 506 from .the winding of start .relay `509 Jto vthe `out-.start .con- Aductor "55'2, and through 'the upper winding .of relay 508 to v'battery at the upper hack contact of relay -530; at vits inner v.lower Yback contact removes vbattery from the windings of relay .5H 'and 1514, and from the .vertical magnet 15.!2 and its upper front contact shunts the upper winding of relayI I. Relays .5U .and .5I4 now release and relay 50'9 -being s'low to .release .releases .after .an interval sufncient to allow `ground .to be applied to conductor 5LB .at .thesender .to hold relay 520 vand relay 2 l'o'f ithe trunkoperated.

When .relay 5M releases the continuity .of the out-.start conductor "is established .at its lower contacts wherebyif a second trunklin the `same subgroup should bein a `calling condition, ground placed on the 'in-.starl-conductor 506 will be eiective to start lthe second trunk .nder v.of the same subgroup of `nders, .ifit is idle, .over a circuit 'extending from conductor ..506 over vthe middle norn mal contacts `.of .testjack 50.1, .the inner upper front contacts of .relay 5.08, the lower normal contacts `oi relay 5M, conductor 552, .the lower normal contacts oftest jack 501, .the middle normal contacts .of 'test jack 501 .associated with the second trunk lnder ...of -the same .trunk-ilnder group, .over .the upper normal contacts vof relay 508 to the start relay .of such second iinder corresponding to .relay 5.0.9.

Had 'the calling .trunk been in `the .subgroup vof a .second .or B ,group of one hundred trunks, a group relay I'lllL ,corresponding Ato .one of the group relays 50i, associated with the A group-.of trunk finders would have .been .operated to .cause the ,operation .of the start relay .of an idle trunk nder such, for example,.;as the :start relay I-09 .ofthe .trunk nnder .i100 of Eig. l. .It is to benoted that the iinder '5&0 is paired with the iinder 00 and the brushes .thereof .are connectible vto Acon-- ductors `5I0 and 521 to .53.3, inclusive, to which the brushes of trunk nder '500 `arealso connectible and which-extend to a sender. In order 10 therefore that it may notbe `possible to Vconnect two `trunks'to a single sender over the vbrush'es of 'the pair oftrunk nders 500 and I00,'thef1nder 500 is .made a preference :nder and the ystart circuit for "thejn'der "|10 0 is eXten'ded `from Vground at the contacts o'itthegroup'relay 4i011.. over conductor 106, the `inner upper `normal contacts .of relay `I 08 of vthender 100, .conductor 554,*o-ver the lower 'back contact of :relay 500 o'f n'der .5010, conductor 1555, vthrough 'the winding .of 'start relay "I'09 of the lnder 'I00 'to'.b'attery. If the'n'der 500 is in use, its relay 500 will be operated and consequently .the start circuit .cannot 'be completed to start relay |09 of iinder 100. However,

the start .circuit will be extended .over conductor 551i, 'the lower iront contact of relay 500, conductor 55S, over the Ainner upper normal contacts of relay H08 of .the ilrst available iinder` of the .'B group, 'thence over Athe back contacts of therelay 5.09 of the finder "of the A group 'paired therewith, tozthe'start relay '|09 ofsuch available lnder if 'the paired 'A group .nder is notin .use or vover a fron-t contact of relay 509 'and over contacts of similar relays 509 and T08 throughlthe start Vrelay "'IB'Sof a`Bgroup nder whose paired A group finder is notin use. i

When t'he 4trunk iinder .seizes the 'terminals of the calling trunk and `completes the circuit previously tracedromb'attery through'the winding of irelay'215 .over conductor 2H, relay '215 operates and locks itself .directly `toifground applied .over conductorIZ'II .from ,the trunk finder andat alater time from the sender, over .its upper No. C1 front contact. As soonv as ,relay 302 releases following the completion off the registration .of theimpulse series in the digit register 3150 a circuit is completed 'for transfer relay 2.0.9 which may 'be traced 'from battery through .its winding, over conductor 2 I3, lthe lowerback contact of relay36, ,the upper hack contact orelay '302, conductor 301., .the upper No. -2 front contact ofrelay '2I5 conductor i308, the upper .contacts of off-normal switch 355 of register .350 Lto ground oyerthe lower No. 3 back .contactof .relay .303. 'Relay '.209 operates whereupon thedialing circuit previously .traced .over the calling line loop and `through the windings ofrelayzl is disconnected .rom the windings of vsuch relay .and transferred to'ltheselectedsender. rRelay ,2.07 .now releases 1followed by the release .of slow-.toerelease relayZI'I, but with relay .L2-i5 .now operated, relay 30.0 is .he-ld `.operated .over -a circuit .extending from battery Ythrough its winding, over .conductorlwl, .thellowerrNd .1 .contacts of relay .21,5 to ground over the lower No. 3 back contact of relay 21.0.

AShould an idle sender not be-.connected .to the trunk before th'ersecond trainof impulses is receivedfin the trunk, relays -.2I5 wand 2209 `will not be operated and,y therefore, when V.relay .2.01 releases on the first .impulse `of .this .digit series `a circuit will be established from ground Aover the upper No. 5 .normal contacts of relay ,209, ythe hack ccntactpfre'lay 201, ,the upper .frontcontact of .relay .'ZI I, `.conductor 212., ,the lower lalternate contact of offenorrnalrcontacts 35.5., .the innervuppe-rback .contact of relay ,302, -through'the windn ing of relay ".310 `to .bat-tary., whereupon ,relay 310 operates .and establishes .a crcuit from lbattery through the winding .of .relay 2id, .over conductor Sill, Lthelower contacts of relay .310, to ground over ,the .upperlNotLZ hack contact of relayV 305. Relay. 2 lll .therefore operates, locks over A-its upper No. l contacts `and.conductor.i312 :to'groundnover the inner lower front contacts of relay 300; ap-

plies all-paths-busy tone from the .source 230 over its lower No. 1 contacts, the tip conductor 200 of the trunk and thence to the calling line; connects ground over its lower No. 3 front contact, the normal contacts of jack 204 and thence as traced to sleeve conductor 202 to hold the selector 184 and the line nder 183 from releasing; at its lower No. 3 back cont-act removes ground from start conductor 216 extending to the trunk nder and at its lower No. 2 back contact opens the connection from ring conductor 220 extending over the lower No. back contact of relay 210, over the lower No. 1 back contact of relay 232, the lower No. 2 back contact of relay 214, through resistance 23 I, over the lower No. l normal contacts of relay 209 to the tip conductor 2,19, whereby the sender, when attached, is given a disconnect signal.

In response to the all-paths-busy tone the calling subscriber restores his receiver to the switchhook, whereupon relay 201 releases followed by the release of relay 211 and the release of relay 300. With relay 214 operated the sender, if attached, will have received a disconnect signal and will thereby cause the release of relay 215 of the trunk. With relays 211, 215 and 300 all released, a circuit is established for release magnet 354 of digit register 3'50 which may be traced from battery through its winding, over conductor 313, the upper back contact of relay 211, the upper No. 2 back contact of relay 215, conductor 308, the upper contacts of off-normal springs 355 to ground over the lower No. 3 back contact of relay 303. Magnet 354 thereupon operates to release the brushes 351 and 352 of register 350 to their normal positions whereupon springs 355 restore to their normal position thereby opening the circuit of magnet 354. Relay 300, upon releasing, also releases relay 214. With relays 300 and 214 both released holding ground is removed from the winding of sleeve relay 203, which releases, and from sleeve conductor 202 to initiate the release of the operated selector 184 and line finder 103,

It will be assumed, however, that an idle sender is attached to the trunk prior to the receipt of the second impulse series in the trunk. Prior to the operation of transfer relay 209 a loop circuit is established from battery through the middle winding of dial impulse responsive relay 1000 of the sender, through retard coil 1001, conductor 1002, thelower No. 4 back contact of relay 800, conductor 801, the inner upper back contact of relay 100, conductor 101, the lower No. 1 normal contacts of relay 600, the lower No. 3 back contact of relay 601, conductor 528, the upper No. 4 contacts of relay v520, brush 522 of trunk nder 500, conductor 220, the lower No. 5 back contact of relay 210, the lower No. 1 back contact of relay 232, the lower No. 2 back contact of relay 214, resistance 231, the lower No. 1 back contact of relay 232, conductor 219, brush 521 of trunk finder 500, the upper No. 5 contacts of relay 520, conductor `521, the upper No. 2 back contact of relay 600, the upper No. 1 normal contacts of relay G00, conductor 102, the inner lower back contact of relay 100, conductor 802, the upper No. 2 back contact of relay 800, to ground. The retard coil 1001 in series with the middle or primary winding of 'relay 1000 and the condenser 1003" and resistance 1004 connected in parallel with the retard coil 1001 and middle winding of relay 1000 constitute an arrangement which enables relay 1000 to withstand transient conditions and thereby give satisfactory pulsing. The

upperl or secondary winding of relay 1000 is'connected in series with condenser 1000 and resistance 1001 to reinforce the primary winding and make its operation and release more positive and therefore more insensitive to transients. The lower or tertiary winding serves as a biasing winding and tends to keep the relay armature in its released or back contact position.

At the time ground was connected to conductor 510 at the trunk iinder 500, a circuit was completed over the upper No. 1 normal contacts of relay 103, over the inner upper normal contacts of relay 104, to battery through the winding of ofi-normal relay 105 whereupon relay 105 operates to connect ground to the off-normal ground conductors 106 to 110, inclusive, of the sender. Ground is, therefore, connected over conductor 101, the upper No. 2 back contact of relay 602 and conductor 1011 to the armature of relay |000 and through the lower or biasing winding of relay 1000 and resistance 1012 to battery. As previ.- ously stated, relay 1000 is thus biased to hold its armature on its back contact to thereby shunt and discharge condenser 1013 through resistance 1014 until the dialing loop is completely through .the middle winding of relay 1000 as previously traced. Y

When relay 1000 operates over the loop a circuit is established from ground on conductor 1011, over the front contact of relay |000, conductor 1010, the lower No. 1 back contact of relay 003, conductor 1008, through the winding of relay 1008 and resistance 1001 to battery and in parallei with resistance 1001 to battery through the winding of relay 1015. Relay 1008 operates and releases with relay 1000 but relay 1015 being slow to release remains operated continuously during dialing and establishes an obvious circuit for relay 1016 which also remains operated during dialing and after relay 1015 releases on the trunk cut through.

Relay 1015, upon operating, also establishes a circuit from. ground over its upper contacts, conductor 1019 and the upper back contact of relay 104 to battery through the winding of relay 105, to hold relay 105 operated and the ground is extended over the inner upper back contact of relay 104, and the upper No. 1 normal contacts of relay 103 to conductor 510, extending to the trunk finder 500 to replace ground applied to conductor 510 by relay 509, which latter relay releases after the trunk finder has found the calling trunk,

After the operation of transfer relay 200 of the trunk, conductor 219 of the loop circuit previously traced through the middle winding of relay 1000 is connected over the lower No. 1 alternate contacts of relay 209 and the upper No. 6 back -contact of relay 210 to the tip conductor 200 of the ticketing trunk and conductor 220 is connected over the lower No. 5 back contact of relay 210, the lowerNo. 1 back contact of relay 232, the lower No. 2 back contact of relay 214, the lower No. 3 contacts of relay 200, the lower No. 2 back contact of relay 210, to the ring conductor 201 of the ticketing trunk, whereby relay |000 is Placed under the control of the calling subscriber. Upon release of relay 1008 in response to the first dial impulse received from the calling line, relay 1011 operates over a circuit from battery through its winding, over the back contact of relay B, the inner lower front contact of relay 1016, and conductor 1018 to ground at the upper back contact of relay 504 and, being slow to release, remains operated during an impulse series. Since the present invention is not con- .Maasai pulses under the contro-l of relays |000, t0 |15, |010 and V1.011, .the impulse .counting relays controlled .thereby 1and the .digit registers for registering .dialed digits are ynot disclosed. 4For a full .dis-

closure of such .apparatus and va description .of the operation thereof, reference may be .had vto the .application .of -J W. Gooderham, .Serial No. 448,782, .led .concurrently herewith. With :relay l0 It .operated -a circuit is established from ,ground .over .its lower front contact and conductor |020 to .battery through the `winding of off-normal relay .1.00, which upon operating connects vground .to .off-snormal .conductors 11.2, 1|.3 :and .114 vand .connects .ground directly over .its .upper No. 1 .alternate .contacts .to `conductor .5| 0, extending to .the trunk finder 1500.

Party identification test `When .oli-normal .relay 1.05 operated a cir-.cuit

was .establishedro-m battery overit-s lower No. 1

- establishes a circuit for relay .608, which may b-e traced from battery through the winding thereof, over .the lower'No. '1 normal contacts of relay .00.5,

'to yground on .oil-normal ground .conductor '108. Relay 60.8, upon operating, closes an obvious .cirn cuit over its inner .upper vfront contacts through the winding of relay 00.9 tofbattery, whereupon relay 609 .operates 'in turn establishing .a circuit extending fromba'ttery .on conductor 1li., through the upper winding .of .relay 006, over the inner lower front contact of relay `609, to vground on conductor 106. With both windings energized, relay .600 Aoperates ,and establishes a .circuit 'from ground applied to conductor 112 upon theoperation of oit-normal relay 103, over the Alront contact of relay .6.06, .the upper back Contact of relay BID to battery through the winding .of relay .6.00. Relay 600, upon operating, locks over lits lower No. 2 contacts to ground over .the inner .upper normal contacts of relay Sill. These .relays all remain .operated under the control `of relay'llS.

When the sender was cut through .to the calling trunk bythe operation of relay '520 of the trunk finder 500 a circuit was .established from .ground over the upper No. '3 back contact of relay 208, conductor 246, Ithrough the winding of trunk connector relay |100 ,individual to the calling trunk of ,the sender-trunk-connector .circuit of Fig. 1l, over conductor 222, brush'524lon lthetrun'k finder, the lower No.3 contactsof relay 520,.con-

ductor 5.3.0, the lower No.2loack contact of relay 0.05, through the windings of the three-position polarized relay GH, the upper No. 3 back contact of relay 605, through resistance '6|'2 to battery and ground. Relay 6H operates over this circuit in -.such amanner as to close its .lower contacts whereupon relay 0.13 operates in a circuit from battery .throughits winding, over the'lowercon.- tacts of relay 6H, to ground onl oiT-normalground conductor 109, locks oyerit-s upper No. 1 contacts to ground on conductor 19.9. and establishes a biasing ,circuit .from the `11G-volt battery G18. through resistance 6M 'and the upper winding of relay 61 5,.'over its upper No. 2 contacts to ground, whereby relay 0I`5 is prepared for operation.

`When .relay |011 cperatesat .the start of .the rst ,digi-t to .be Jregistered in the sender, 1.a circuit is established from ground over a front .contact thereof, Aover the front contact of an vin-.steering relay v(not :shown-l ,conductor 102|, the .lower No. f'

.1 contacts -of-.relay .64.3, over the upper No. .0.

:normal-contacts and through the winding of .relay 005 to battery. Relay .6.05 thereupon .foperatea locks Yover .its `upper No. 1 alternate 4contacts .to groundon off-normal ground conductor 10B, Aand transfers the `holding vcircuitior relay 608 over its lower No. 41 transfer contacts ,from ground on the oi-normal .ground .conductor 108 to ground .appliedto conductor |02.| by .relay .|011 .over the lower Nos. \1 and v2 .contacts ofrelay .613. When relay |.0|.1 releases .at the .end ofthe rst Ydigit series Vldialed .into .the sender, .relay 608 releases, in turn Areleasing relay .6.09, which opens -thecircuit of condenser timed vrelay .606. Wthrelay 0.00 released ashunt .extending .from ground .on conductor 1.06, over `.the/inner .lower .front contact of .relay .60.9, through condenser .615 .and resistance'll to .ground is opened vand vcondenser .61.6 now .starts to charge in .a .circuit from battery., over conductor 1| through the upper winding of .relay |506, through condenser .616 .and resistance '61.1 to ground, and until the condenser .bccomes Vfully charged and the .charging .Curr-enit .therethrough ceases to flow, vrelay 006 v4is maintained operated.

With relays 6'03and1609 bothreleasedgand until relay, 600 finallyv releases, `a ,circuit is vestalolished from the source '010 of .11G-volt Ycurrent,,through the .lower winding of relay 615, thenpiler back contact .of relay .6|9, ythrough the rectifier Z620.. over the upper back contact of .relay .600., the

lower No. 1 .alternate ,contacts of relay Gilliland thence as .traced tothe ring .conductor 2D] of .the ticketing trunk and .to the ring .conductor |08 .of the calling line, .and in parallel over .the lower back .contact .of relay 16.08., and .the upper No. .1 alternate contacts of .relay 10.00., .and thence ,as traced to the .tip conductor 2.00 Aof the .ticket-ing trunk, and tothe tip lconductor .|89 of thelcall-ing line. During the time that the lower .winding o'f relay 0 l5 is thus connected to .the .tip and Jring conductors of the .callingline pulse .receiving frelay |000 -is Vmaintained.operated in .the circuit previously traced from battery vthrough its :middle winding to .conductor 10|, Athenceover .the..upper back .contact of .relay .0.03, oyer the upper vand lower No. 3 contacts of relay .0.00 :to ground through resistance 52 l.

Relay/'.000 is timed .by .the condenser 61.6 land resistance `|511 to release in approximately ..0.5 second .after the release of relay `01.10 and, therefore, the lower winding '.of y.party .test relay .615 is connected .to .the vconductors of `the calling V.line for this interval. lf .the .calling subscriberis .a tip party of .a two-party flat .rate line, .relay .E L5 will 'becperated .oyer the.3.640ohm resistance ground .at such tip, station. It having .been assumed that .establishes circuit .from .battery .through yresistance flarnp 02.2, l`over the lower No. .-1 vbaclcfcontact of relay 6.23, .through the 'winding :or relay 5624, ouer'the lower back contact 'of relay :.6 39, :the `1front contact of `|relay 'lil-5, the yupper No. i2 contacts :of relay 00.0, .the lower .back V.contact of :relay .6I-0, the lower Yback '.:con'tact .of relaylll tozground on oil-normaliground :conductor 10.12. Relay $.24,

'15 upon operating, locks over its upper No. 1 contacts, conductor 625, the lower back Contact of lend-of-dialing relay 803 to ground on oir-normal ground conductor '|I2; establishes the operating circuit of relay 666 from ground cn conductor 625, over its upper No, 3 contact, the lower No. 3 back` contact of relay BIS, through the upper vwinding of relay B06 to battery on conductor 1| Aestablishes a circuit from ground on conductor 625, over its upper No. 2 contacts, through the lower winding of relay 6 l 9 to battery; opens at its lower No, 1 back contact the operating circuit of relay 623, and at -its lower No. l front contact conn ects battery through lamp 626 and over the upper No. 3 back contact of relay 6|9 to the line side of the lower winding of relay 6|5.

Relay 6|9, upon operating, extends its operating ground over its upper No. 1 contacts and through the upper winding of relay '|I6 to battery; connects ground over its lower No. l contacts to shunt resistance 661 from the circuit v through the lower biasing winding of timing relay 606; opens the circuit through the upper or operate winding of relay 606; disconnects the 11G-volt source of current 6I8 from the subscribers line `and establishes the circuit of relay 6|0 extending from ground over its lower No. 2 contacts to battery through the winding of relay 6|0. With resistance 601 shunted relay 666 releases approximately .015 second following the opening of its operating circuit and until it releases relay 600 is held operated over its own lower No. 2 contacts, the inner upper alternate contacts of relay 6|0 and the front contact of relay 666 to ground on off-normal conductor 1|2. During the time that relay 606 remains operated current from the 48- volt central oce battery is applied through lamp 626, over the lower No. 1 front contact of relay 624, through rectiiier 620, the upper back contact of relay 669 and in parallel over the lower back Vcontact of relay 608, and thence as traced over the No. 1 upper and No. 1 lower alternate contacts of relay 600 to the calling line. When relay 606 releases it in turn releases relay 66|) and disconnects the source from the line. This application of current from the 48-volt battery is for the purpose of discharging the line in such a way as to prevent bell tapping at the substation.

With relay 606 released the previously traced circuit over the calling line and through the middle winding of relay 608 is reestablished and the local holding circuit for relay |666 is opened. The partyidentication is now completed and the sender is ready to receive the next digit series dialed bythe subscriber. A complete test cycle, that is, testing the line, discharging the line after the test, and the functioning of the test control relays as just described, is such that the open period introduced into the dialing circuit does not exceed .150 second.

If'the calling substation is not a tip party of a two-party nat rate line, relay 6| 5 will not operate when relay 666 releases for the first time. With relay SI5 unoperated, when' relay 656 releases a circuit is established from ground on conductor H2, over the back contact of relay 666, the lower back contact of relay 6| 6, the upper No. 2 contacts of relay 666, the back contact of relay 6!5, the winding of relay 623, over the lower No. 1 back contact of relay 624, through lamp 626, to battery. Relay 623 thereupon operates causing the operation of relays 6|!) and in the' manner previously described in connection 4with the operation of relays 6|9 and 7| 6. The

circuit then functions in the manner previously described. y

At the end of the party identication test relays 6|0, GIB and 624 remain operated if the calling party is the tip party of a two-party flat rate line under the control of the end-ofdialing relay 803 and relay 'H6 is held operated in a circuit over its lower winding and lower No. 1 contacts to ground onoff-normal conductor 'H2 under the control of o-normal relay 103. With relay H6 operated relay 1| 3 is operated from battery through its winding, over the upper No. 1 contacts of relay H6, and the upper No. 2 back contact of relay H7 to ground and relay 'H8 is held operated over its upper contacts to ground on off-normal conductor '|06 under the control of off-normal relay 105. If the calling party is not a tip party, relays 6|0, 6|-9 and 623 remain operated under the control of relay 803, and relay 'H1 is held operated in a circuit over its lower winding and lower No. 1 contacts to ground on conductor 'H2 under the control of relay 163.

When the first digit has been received in the sender, an idle identier, such as is disclosed schematically by the box 900 on Fig. 9, is associated with the sender by an identifier-connector and the identifier is associated with the calling ticketing trunk by an identifier-trunk-connector circuit. If, as a result of the party test, relay 6 has been operated, a circuit is established from ground over its upper No. 3 contacts and conductor H9, thence over contacts of the identhier-connector to the identifier 900 to operate a tip party relay therein to register the fact that the tip party on .a two-party flat rate line has initiated the call. If ring party relay has been operated, a circuit would be established from ground over its upper No. 2; contacts and conductor "|20, extended over contacts of the identhier-connector to the identifier 906 to operate a ring party relay therein. Upon the operation of the identifier-trunk-connector a circuit is es tablished for relay 2| 8 of the trunk which may be traced in part from the identier 900, over conductor extended over contacts of the identhier-connector to conductor 529, thence over the No. 2 lower contacts of relay 520, trunk-finder brush 523, conductor 22|, through the winding of the three-position polarized relay 2|8 of the trunk, over the upper No. 4 contacts of relay 2|5, and through resistance 233 to battery and over the upper No. 3 contacts of relay 2|5, through resistance 254, over conductor 255, over the upper No. 1 contacts of relay 303, conductor 3M, the lower contacts of off-normal switch 465 of the tens elapsed time register 400, lower No. 1 back contact of relay 406, to ground over the normal position terminal of the arc of register 450 with which brush 45| is engaged if this register is in its normal position. If the registers 400 and 450 are both in their normal positions and the relay 466 is not at the time operated, relay 2|8 now operates to complete the extension of control conductors from the trunk to the sender.

A circuit is now effective for transferring the registration of the digit register 350 of the trunk which may be traced in part from battery applied at the identifier over contacts of the identifiertrunk-connector, thence over conductor 234, the upper No. 2 contacts of relay 2|8, conductor 3|5, brush 35| assumed to be standing on the No. 2 terminal of its arc and a conductor of cable 3| 6 extending over contacts of the identifiertrunk-connector to ground through the winding 

